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Note You are very unlikely to want to customize the controller_scan() function in your own application, but I ve mentioned it here so that you are aware of its behavior when you see it crop up in some of the examples in this chapter.

Summary

The entire attribute value must be enclosed in quotes to prevent attribute-injection attacks. First, it is necessary to escape the quote character that is used to delimit the attribute s value to prevent the closing the quote attack. While the HTML specification allows either double or single quotes to be used to enclose attributes, it is advisable to decide on a convention and use one type of quote throughout the application. It is nevertheless advisable to use an HTML escaping function that escapes both types of quotes, in case of deviation from the convention. Second, it is necessary to escape the ampersand character. Older versions of the Netscape browser support so-called JavaScript entities (see Netscape s JavaScript Guide ). This allows a string of the form &{javascript_expression}; to be used within attributes; the expression is evaluated and the entire entity expression is replaced with the result of this evaluation. An attacker who is able to inject ampersand and curly-brace characters into an attribute could be able to execute malicious script. While non-escaped angle brackets in attribute values do not result in XSS vulnerabilities in popular browsers, it is safest to escape them nevertheless. This also ensures that the resulting HTML is well-formed and allows you to use the same HTML-escaping function as elsewhere.

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By carefully defining routes and specifying their order in the route map, it is possible to quickly and easily map quite complex URL structures into simple sets of routing variables that can be used in your application. Before you go on to look at the details of how to write your own routes, let s take a brief look at how Pylons uses the routing variables to call a particular controller action.

Once a URL has been matched against a route and the controller has been verified to exist, Pylons checks to see whether it can find the action. Pylons is set up so that any controller methods that start with an _ character are not considered actions at all and cannot be called as a result of a URL dispatch. If the action specified in the routing variables doesn t exist or it starts with an _ character, then the check fails. In debug mode for development, this raises an exception to explain the mistake; in production mode, it simply results in a 404 Not Found error page being displayed. If the controller and action both exist, then Pylons looks for a __before__() method attached to the controller class. If the method exists, it is executed. The __before__() method can therefore be used to set up per-request objects or perform other processing to be carried out before each action in the controller is called. Next, Pylons inspects the action to see what arguments it takes and calls it in such a way that any arguments that have the same names as the routing variables are called with the value of the routing variable as the argument. Here are some examples: # No routing variables used in the action def no_routing_variables(self): return 'No routing variables used'

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